p.1 #1 · New Canon R5, mk2, doesn't turn on without a lens attached
My friend just received a new Canon R5, mk2 and they didn't send the adapter so he could mount his EF lenses.
The camera won't turn on. I've never seen a camera that had to have a lens on it to turn on.
Any helpful replies would be appreciated. Thanks in advance.
p.1 #6 · New Canon R5, mk2, doesn't turn on without a lens attached
He attached the grip (I didn’t know he didn’t try the camera without the grip).
He removed the grip, reattached the battery door with battery in and the camera now turns on.
Now he’ll need to try the grip again.
p.1 #7 · New Canon R5, mk2, doesn't turn on without a lens attached
Kenneth Farver wrote:
He attached the grip (I didn’t know he didn’t try the camera without the grip).
He removed the grip, reattached the battery door with battery in and the camera now turns on.
Now he’ll need to try the grip again.
This is from memory, but I seem to recall post somewhere that if the grip only has one battery it needs to be in a particular battery location (maybe slot 1).
p.1 #10 · New Canon R5, mk2, doesn't turn on without a lens attached
He should read page 22 of the manual.
There are multiple versions of the LP-E6 battery that the R5II uses, going back to the original 5D series, etc. The first version, the LP-E6, is incompatible with the R5II. The next two versions, LP-E6N will power the camera but have certain limitations.
If he is coming directly from a recent 5D version, I would recommend he buy a few of the latest 'P' version to achieve full compatibility. Also, from my experience, the third party NH batteries that I used without problem in other cameras were rejected by the R5II. It would turn on but immediately show an error message and not function.
Jan 09, 2026 at 11:34 AM
AmbientMike Offline • • • • • • [X]
p.1 #11 · New Canon R5, mk2, doesn't turn on without a lens attached
Basically most of these cameras (regardless of brand) use 2 li ion batteries like they did 20+ years ago. They ask about lot more of the batteries though.
Both the LP-E6 and Sony NP-FZ100 battery listed at 7.2V. BP-511 has 2 li ion batteries, too
